Our single-rivet boltless shelving units attach tightly to one another without using loose fasteners. All rivets in the boltless shelving are attached to all left to right and front to back beams and align with keyhole slots in the vertical posts. Boltless shelving is easy to assembly with using a rubber mallet just tap everything into place. Starter units include four standard angle posts, four left-to-right standard double rivet angle beams, four front-to-back standard double rivet angle beams, two left-to-right standard single rivet beams per level and two front-to-back standard single rivet beam at one intermediate level.